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Virtual Machine placement - Nova filter and weight


is it possible to configure such a filter/weight in nova that will lead the scheduler (during the VM booting) to choose/prefer a compute where VM of the same type are already instantiated instead of mix VMs of different type on the same compute?

I know that it is possible defining host-aggregate but I do not want to define them statically or when the system is empty. I would prefer some dynamic mechanism that can handle such situation.